Combust

Combust is a 1-Energy Ironclad Power that at end of each turn deals 5 damage to all enemies and costs you 1 HP (10 damage upgraded). The 1 HP per turn cost compounds over long fights but the damage output is passive and automatic. In multi-enemy fights, Combust deals 5 damage to every enemy simultaneously each turn, adding up to significant chip damage without spending additional Energy.

Multiple Combust stacks add up quickly: two copies deal 10 damage per turn to all enemies at the cost of 2 HP. In long boss fights, the sustained AoE can contribute substantially. Upgraded to 10 damage per turn, even a single copy rivals dedicated attack cards in long fights. Best in HP-rich builds or when paired with Reaper for HP sustain.